| 摘要 |
PURPOSE:To increase S/N of the reception signal, and to control transmission frequency, by mixing the output frequency of the voltage control oscillator and the input frequency, performimg phase comparison for the output with the reference frequency and driving the voltage controlled oscillator with this comparison output. CONSTITUTION:In the reception circuit, radio pilot signal is received with the input terminal 1, amplification IFA 6 and phase detection PD7 are made, and the voltage controlled oscillator VCO 10 outputs the signal in which the oscillation frequency is changed with the control voltage signal, and the output of the frequency variable signal and the reception circuit is converted with the frequency converter 15. Further, this converted output is fed to the oscillator 10 as control voltage signal by taking the output of the given reference frequency oscillator 11 as reference, transmitting transmission signal. In this, case, to the frequency variation the reception pilot signal, by forming the frequency variation of transmission signal toward reverse, the S/N of reception signal is increased and the transmission signal can be controlled. |
